If PreSonus Hub shows that all the plugins you have installed in the Hub are activated in the Hub, then you should see them in your DAW of choice. If you do not, then please go to the VST3 folder on your Mac (Mac HD > Library > Audio > Plug-Ins > VST3), and see if you can see a file labelled "PreSonus VST3 Shell.vst3". If you see that, please try deleting the spaces in the filename. Please ensure you do this with your DAW CLOSED. Then, relaunch the program and see if you see the plugins listed in the plugins list wherever that is in your DAW.
If you continue to see an error message, or this does not resolve the issue, please follow the steps below:
To begin with, please take a look at the following article and apply this permissions fix to your Mac if applicable,
-If the issue persists, please go into Users/Shared/Library/Application Support/PreSonus and delete the Extensions folder, the License Store folder, and the PreSonus Hub folder.
-Next, hold down your "Option" key on your computer keyboard while clicking "Go" in the Finder menu bar until the hidden "Library" appears. You can then go into Application Support and delete the PreSonus Hub folder.
-Next, delete the PreSonus Hub from your Applications folder and download from your my.presonus.com account once more.
-Next, please go into Macintosh HD/Library/Audio/Plug-ins. Delete the PreSonus VST3 Shell.vst3 file from the VST3 folder and the PreSonus AU Shell.component file from the Components folder.
-Finally, re-install the Hub as well as the plug-ins and activate.